using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        bool Drow;
        Pen pen = new Pen(Color.Black);
        Font font = new Font("Times New Roman", 12.0f);

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "Painting";
            button1.Text = "Paint";
            button2.Text = "Clear";
            button3.Text = "Color";
            button4.Text = "Text";
            button5.Text = "Font";
            button6.Text = "Save Picture";
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox1.SelectedIndex == 0)
            {
                textBox1.Visible = true;
                textBox2.Visible = true;
                textBox3.Visible = true;
                textBox4.Visible = true;
                textBox5.Visible = false;
                textBox6.Visible = false;
                checkBox1.Visible = false;
            }
            if (comboBox1.SelectedIndex == 1)
            {
                textBox1.Visible = true;
                textBox2.Visible = true;
                textBox3.Visible = true;
                textBox4.Visible = true;
                textBox5.Visible = true;
                textBox6.Visible = true;
                checkBox1.Visible = false;
            }
            if (comboBox1.SelectedIndex == 2)
            {
                textBox1.Visible = true;
                textBox2.Visible = true;
                textBox3.Visible = true;
                textBox4.Visible = true;
                textBox5.Visible = false;
                textBox6.Visible = false;
                checkBox1.Visible = true;
            }

            if (comboBox1.SelectedIndex == 3)
            {
                textBox1.Visible = true;
                textBox2.Visible = true;
                textBox3.Visible = true;
                textBox4.Visible = true;
                textBox5.Visible = false;
                textBox6.Visible = false;
                checkBox1.Visible = true;
            }

            button1.Enabled = true;

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Graphics Graf = pictureBox1.CreateGraphics();
            Graf = pictureBox1.CreateGraphics();
            if (comboBox1.SelectedIndex == 0) Graf.DrawLine(pen,
            Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text),
            Convert.ToInt32(textBox3.Text), Convert.ToInt32(textBox4.Text));
            if (comboBox1.SelectedIndex == 1)
            {
                Graf.DrawLine(pen, Convert.ToInt32(textBox1.Text),
                Convert.ToInt32(textBox4.Text),
                Convert.ToInt32(textBox2.Text), Convert.ToInt32(textBox5.Text));
                Graf.DrawLine(pen, Convert.ToInt32(textBox2.Text),
                Convert.ToInt32(textBox5.Text),
                Convert.ToInt32(textBox3.Text), Convert.ToInt32(textBox6.Text));
                Graf.DrawLine(pen, Convert.ToInt32(textBox3.Text),
                Convert.ToInt32(textBox6.Text),
                Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox4.Text));
            }
            if (comboBox1.SelectedIndex == 2)
            {
                if (checkBox1.Checked)
                {
                    if (colorDialog1.ShowDialog() == DialogResult.Cancel)
                        return;
                    Brush zal = new SolidBrush(colorDialog1.Color);
                    Graf.FillEllipse(zal, Convert.ToInt32(textBox1.Text),
                    Convert.ToInt32(textBox2.Text),
                    Convert.ToInt32(textBox3.Text), Convert.ToInt32(textBox4.Text));
                }
                else
                {
                    //Pen ElPen = new Pen(Color.Black);
                    Graf.DrawEllipse(pen, Convert.ToInt32(textBox1.Text),
                    Convert.ToInt32(textBox2.Text),
                    Convert.ToInt32(textBox3.Text), Convert.ToInt32(textBox4.Text));
                }
            }
            if (comboBox1.SelectedIndex == 3)
            {
                Graf.DrawRectangle(pen, Convert.ToInt32(textBox1.Text),
                    Convert.ToInt32(textBox2.Text),
                    Convert.ToInt32(textBox3.Text), Convert.ToInt32(textBox4.Text));
            }
            pictureBox1.Update();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Graphics GC = pictureBox1.CreateGraphics();
            GC.Clear(SystemColors.Window);
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            Graphics graf = pictureBox1.CreateGraphics();
            if (Drow == true)
            {
                graf.FillEllipse(Brushes.Violet, e.X, e.Y, Convert.ToInt32(numericUpDown1.Value),
                Convert.ToInt32(numericUpDown1.Value)); // толщина кисти
            }

        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Drow = true;
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            Drow = false;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            String Text = String.Format("{0}", textBox7.Text);
            Brush Кисть = new SolidBrush(Color.LimeGreen);
            Graphics G = pictureBox1.CreateGraphics();
            G.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
            G.DrawString(Text, font, Кисть, Convert.ToInt32(textBox8.Text), Convert.ToInt32(textBox9.Text)); // Координаты размещения текста
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == DialogResult.Cancel)
            {
                return;
            }
            pen.Color = colorDialog1.Color;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (fontDialog1.ShowDialog() == DialogResult.Cancel)
            {
                return;
            }

            font = fontDialog1.Font;
        }

        private void button6_Click(object sender, EventArgs e)
        {
            Rectangle r = pictureBox1.RectangleToScreen(pictureBox1.ClientRectangle);
            Bitmap b = new Bitmap(r.Width, r.Height);
            Graphics g = Graphics.FromImage(b);
            g.CopyFromScreen(r.Location, new Point(0, 0), r.Size);

            SaveFileDialog savedialog = new SaveFileDialog();
            if (savedialog.ShowDialog() == DialogResult.OK)
            {
                b.Save(savedialog.FileName);
            }
        }
    }
}